evga1300 has 4x1pcie + 2x2pcie
use 2x1pcie + 1x2pcie for 1 antminer s5 and it will be ok (1x2 pcie connect to 2 boards, one single pcie to first board and second single pcie to second board. Do not connect 1x2pcie to 1 board and 2 single pcie cables to second board)